Speed
Laser cutting machines excel at accurately cutting metal. Plasma cutters are 2X less accurate than laser cutters. Plasma lasers are capable of cutting metals to a precision of 0.1mm (or.004 inches). Laser cutters cut:.05mm and.002 inches.
Laser uses light to cut steel. For metal piercing and cutting, light must be concentrated to one point. A magnifying glass can be used to focus the sun's rays onto one point, and then it can be burned. This is how cutting using light works.